select kqdt.signindate,kqdt.signoutdate,kqdt.signintime ,kqdt.signouttime,
       FLOOR(
           datediff(minute,signindate + ' ' + signintime,signoutdate + ' '  + signouttime)/60.0 - 8.0
        ) overtime,
       kqdt.changeType
from kq_format_detail kqdt
join kq_holidayset kqst on kqdt.signindate = kqst.holidayDate
where signindate is not null
and signoutdate is not null
and signindate <> '' and signoutdate <> ''
and FLOOR(datediff(minute,signindate + ' ' + signintime,signoutdate + ' '  + signouttime)/60.0 - 8.0) > 0